Abstract
The use of nanoporous-sensitive covering that has extended surface of interaction is one of the ways to increase the sensitivity of sensors. Рorous anodic alumina (PAA) due to its unique nanoporous structure, physical and chemical properties, and the simplicity of its fabrication is one of the most perspective materials. Good compatibility of PAA formation with modern thin-film technologies allows to use PAA in multilayer covering for optical biosensors. In the present research, we have developed optical metal-clad waveguide (MCWG) sensors with nanoporous PAA covering.
The developed technology includes a magnetron deposition of the adhesive layer of niobium and aluminum films, formation of PAA waveguide layer and semitransparent Al film by anodic oxidation, widening of PAA pores by chemical etching, and coating of PAA by ultrathin gold layer. The in situ control method of the reflective curves of MCWG with nanostructured coatings in the process anodic oxidation and pore widening has been developed. Research on the covering by SEM method and preliminary immunochemical studies on MCWG Al-PAA-Au were carried out. We found that synthesized recombinant analogue of Staphylococcal protein A (SPA) modified by an additional cysteine residue (SPA-Cys) efficiently immobilized on gold surface of nanostructured coating PAA with thin gold layer retaining its ability to bind human IgG. The data, received in the course of the experiments, proved high sensitivity of immunosensors with nanoporous coatings and their potential for further use in biosensorics.
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Voitovich, I., Lebyedyeva, T., Rachkov, A., Gorbatiuk, O., Shpylovyy, P. (2015). Anodic Alumina-Based Nanoporous Coatings for Sensory Applications. In: Fesenko, O., Yatsenko, L. (eds) Nanoplasmonics, Nano-Optics, Nanocomposites, and Surface Studies. Springer Proceedings in Physics, vol 167. Springer, Cham. https://doi.org/10.1007/978-3-319-18543-9_29
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DOI: https://doi.org/10.1007/978-3-319-18543-9_29
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-18542-2
Online ISBN: 978-3-319-18543-9
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